Trolley shoe



Dec. 18,1923. 1,477,575 I R. J. LYLE 1 y -TROL-LEY SHOE 1.

Filed Feb. 10. 1923 INVENTOR ROBERT J. LYLL Patented Dec. l3, 1%23.

ROBERT JOHN LYLE, OF KINMOUNT, OIETARIG, CANADA.

TROLLEY SHOE.

Application filed February 10, 1923. Serial No. 618,299.

To aZZ 407mm it may concern.

Be it known that 1, ROBERT JOHN LYLE, a subject of the King of Great Britain, and a resident of the village of Kinmount, in the county of Victoria, in the Province of Ontario, Canada, have invented certain new and useful Improvements in Trolley Shoes, of which the following is the specification.

My invention relates to improvements in trolley shoes and the object of the invention is to devise a shoe which will have a maximum wearing life and which will auto matically and positively adjust itself from a forward to a reverse direction or vice versa and it consists essentially of the arrangement and construction of parts as hereinafter more particularly explained.

Fig. 1 is a perspective view of my shoe mounted on a harp and in contact with a trolley wire.

Figs. 2 and 3 are sectional views taken longitudinally through the shoe showing the shoe in the forward and reverse positions.

In the drawings like characters of referonce indicate corresponding parts in each figure.

1 indicates a trolley pole, 2 a harp of usual construction and S a portion of a trolley wire. 4 is a pin extending through 39 the arms 2- and 2 of the harp 2 and s cured therein by means of split pins 5 in the usual manner. 6 indicates my shoe. The shoe 6 is substantially diamond shape in. form providing four wearing contact surfaces 7,

8, 9, and 10, the end portions ll and 12 con necting the surfaces 8 and 9 and 7 and 10 being rounded concentrically to the center of the shoe or of the pin 4. the shoe is preferably open provided with a central hub portion 13 connected to the body of the shoe by web portions l4, l5, l6 and 17. The centre of the hub 13 is provided with an orifice 18 through which the pin i extends. The centre portion of the orifice 18 is enlarged indicated at 19 to form an oil chamber which is filled with wiclring or any other oil retaining material.

20 is an orifice through which the Ciliillh ber 19 is supplied with oil. Each side of the shoe is provided with a flange 21 surrounding the shoe and forming a surroundgroove at the base of which are located the contact surfaces 7, 8, 9 and 10 herein before referred to.

From this description it will be seen that I have provided two pairs of contact sur- The centre of faces, each pair coacting together, that is to say, the surface 8 engaging the wire 3 as indicated in Fig. 2 during th forward motion of the trolley, the surface 7 engaging the wire during the reverse movement of the trolley, these surfaces automatically engaging alternately with the wire. As the trolley starts its forward or reverse movement the shoe being rock d on the pin f by frictional contact with the wire 3, the apex portion 22 located l etween the surfaces 7 and 8 frictionally engages the wire during the change of movement rocking the shoe either to one position or the other.

When the surfaces 7 and 8 have been worn to a cert. i extent a shoe may be removed and inverted so that the surfaces 9 and 10 may be similarly employed.- The shoe may be inverted from time to time until the surfaces 8 and 10 have been worn to the limit.

it will be readily understood that the greater portion of wear will take place on the surfaces 8 and 10 which are used during the forward movement of a trolley, the reverse surfares 7 and 9 being only used comparatively occasionally and for short periods of time and therefore wearing away very much more slowly.

l t hen, as above set forth. the surfaces 8 and 10 have been used up the shoe may be removed and reversed end to end so that the surfaces 7 and 9 which were originally employed for the reverse contact surfaces may be used for forward contact, thereby further increasing the life of the shoe.

il hen the shoe is used in the forward position the current passes through the web 15 when the surface 8 is used as the forward contact surface. When the surface '7 is used for the reverse contact surface the web 1 2 carries the current through the shoe.

Similarly the webs 16 and 17. are employed alternately for carrying the current when the shoe is reversed.

It will, of cours'e,'be understood that the shoe is held in the adjusted position by means of the ordinary harp springs 22 and 23 having frictional contact with the ends of the trolley shoe huh.

From this description it will. h seen that l have devised a very .sii'nple form of shoe which will have a maximum life or wearing quality, which will automatically and positively adjust itself to the forward or reverse position and which may be produced at a minimum cost when length of 3.7111 a sliding trolley shoe, a diamondservice is considered.

hat Icleim as my invention is:

l. A sliding trolley shoe adapted to be mounted on a harp, providing a Wearing or Wire engaging groove substantially diemond shape in form.

2. A diamond shaped shoe, the sides of which form two pairs of trolley Wire engaging grooves, one groove of'each pair engaging the Wire during the forward movement of the trolley, and the other groove of each pair engaging the Wire during the reverse n'ioven'ient oi: the trolley.

shaped Wire engaging groove providing -four long flat contact surfaces, each provided with a separate current conducting Web directly connecting the current collecting surface With the hub of the shoe. said Wch current conductors being located at each side of the center or apex of the dia- ROBERT JOHN LYLE.

the correspond- 

